The sky remains large no matter how important the argument beneath it feels.

However heated it gets, the argument is happening under an unchanged sky. The disagreement feels like the whole world while you are inside it, and stepping outside is often enough to shrink it back to its real size without resolving anything.

Next time you are wound up, go outdoors and look up before you send the message. It is a small physical act with a reliable effect on proportion. What you write afterward will usually be something you are still glad to have written next week.